Optimisation in hash_object

src/objects.c

@@ -1,6 +1,6 @@
 #include <assert.h>
 #include <math.h>
-#include <openssl/evp.h>
+#include <openssl/sha.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -54,27 +54,18 @@ int full_object(struct object *obj, char *buffer, size_t buffer_size)
 void hash_object(struct object *obj, char* result)
 {
     unsigned char md_buffer[DIGEST_LENGTH] = {0};
-    EVP_MD_CTX *ctx = EVP_MD_CTX_new();
+    size_t data_size = object_size(obj);
+    char* data = malloc(data_size);
+    full_object(obj, data, data_size);
 
-    char* hr_size = malloc(decimal_len(obj->size) + 1);
-    sprintf(hr_size, "%li", obj->size);
-
-    EVP_DigestInit(ctx, EVP_sha1());
-    EVP_DigestUpdate(ctx, obj->object_type, strlen(obj->object_type));
-    EVP_DigestUpdate(ctx, " ", 1);
-    EVP_DigestUpdate(ctx, hr_size, decimal_len(obj->size));
-    EVP_DigestUpdate(ctx, "\0", 1);
-    EVP_DigestUpdate(ctx, obj->content, obj->size);
-
-    EVP_DigestFinal(ctx, md_buffer, NULL);
-    free(hr_size);
+    SHA1(data, data_size, md_buffer);
 
     for (int i = 0; i < DIGEST_LENGTH; i++)
     {
         sprintf((result + 2 * i), "%.2x", md_buffer[i]);
     }
 
-    EVP_MD_CTX_free(ctx);
+    free(data);
 }
 
 int uncompress_object(struct object *obj, char* compressed, uLongf comp_size)